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L. J. OROSSLEY, W. EMMOTT & J. P. HARRISON. MEANS FOR BPFEGTINGCOMMUNICATION IN TELEPHONE SYSTEMS.

No. 427,974. Patented May 13, 1890.

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L. J. OROSSLEY, W. EMMOTT & J. P. HARRISON. MEANS FOR EFFEOTINGCOMMUNICATION IN TELEPHONE SYSTEMS. No. 427,974.

Patented May 13, 1890.

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L. J. GROSSLEY. -W. EMMOTT &- J. F. HARRISON. MEANS FOR EFFEGTINGCOMMUNICATION IN TELEPHONE SYSTEMS.

No. 427,974. PatentedMay 13, 1890.

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CROSSLEY AND \VALTER EMMOTT, OF HALIFAX, AND JOHN FRED.

HARRISON, OF BRADFORD, COUNTY OF YORK, ENGLAND.

MEANS FOR EFFECTING COMMUNICATION IN TELEPHONE SYSTEMS.

SPECIFICATION forming part of Letters Patent No. 427,974, dated May 13,1890.

Application filed July 14, 1886. Serial No.208,030. (N0 model.) Patentedin England September 16, 1884, No. 12,445.

To all whom it may concern.-

Be it known thatwe, LOUIS JOHN OROssLEY and \VALTER EMMOTT, bothresiding at Halifax, county of York, England, and JOHN FRED- ERICHARRISON, residing at Bradford, county of York,Englan d, and allsubjects of the Queen of Great Britain and Ireland, have inventedcertain Improvements in the Means for Effecting Communication inTelephonic Systems, (for which British Letters Patent have been grantedto us,No. 12,445, dated September 16, 188a,) of which the following is aspecification.

The main object of our invention is to provide means whereby a persondesirous of using a telephone on a telephonic system can effectcommunication with the central oftice or exchange only by firstdepositing into a suitable receptacle a coin or equivalent circulardisk-like device representing a monetary value equal to the toll orcharge for the use of the telephone.

In carrying out our invention the coin itself or its equivalent is usedto close the callingcircuit to the exchange byactu atin g a mechanicalor electrical device which will make or close such circuit. Thesecircuits of course will be so arranged that while it will be impossiblefor the user to call the exchange until the consideration or toll hasbeen deposited, yet the operator at the exchange can, on the other hand,call up any such user or subscriber, and on the other hand can cut offcommunication at will.

Our invention may be carried into effect in ditterent ways, asillustrated in the accompanying drawings, in which- Figure 1 is aview ofour improved call-box with the upper part of the case in section, andshowing one form of mechanism which may beused, to be operated by thedepositing of the coin to effect a communication with the centraloffice. Fig. 2 is a plan view of the same, the upper part of the casebeingin section. Figs. 3 and are views showing devices substantiallysimilar to those illustrated in Fi s. 1 and 2,but with an additionalimprovement. Figs. 5 and 6 are a side and plan view, respectively, ofanother modifi *ation; and Fig. 7 is aview of a part of the devicesshown in Figs. 3 and 4, but drawn to a larger scale.

Referring to Figs. 1 and 2, A is the inclosing-box, which is dividedinto two portions, the upper part containing the operative mechanism,and the lower being preferably provided with a drawer for the receptionof the coins or equivalent circular disk-like representations ofmonetary values, which are to be introduced through a slit B in the casewhen the user of the telephone desires to call up the central office.

Immediately below the slit B is an inclined chute N, opening at itslower end into a cylindrieal guard 0, open at the bottom and having atthe side a curved finger c, which, as the coin runs down the inclineonto the movable tray D, closing the bottom of the guard, tends to throwthe coin flat onto its face. The movabletray D is carried by a lever D,pivoted at F to a post on the floor of the upper part of the case. Thislever D is provided with an adjustable counter-balance G, which normallykeeps the tray D close to the under side of the receiving-guard O.

In the floor of the upper part of the case, below the tray D, is anopening E, through which the coin falls into the receptacle below as themovable tray tilts downward under the weight of the coin. The pivot-edor tilting lever D carries on its under side an arm III, in a positionto act on an extension of the tongue J of a polarized relay K. Thistongue J is pivoted at II, and its extent of movement under the actionof the coils of the relay is limited by adjustable stops L L. \Vhen thetongue of the relay is in the position shown byfull lines in Fig. 2,aprojection on its extension bears against one of the springcontact-fingers O 0, so as to press the two contacts together. One ofthese contacts O is in electrical communication through a conductor 1with binding-post 6, connected to the earth, while the other contact Ois in communication through the conductor 2 and coils of the relay withthe binding-post Z, leading to the line. A branch 3 from the conductor 2leads to binding-post 15,10 which the ordinary set of telephonicinstruments connect. Normally the tongue of the relay is in the positionshown by full lines in the drawings, so that the telephonic instrumentsare cut off from the line by the short circuit through the contacts 0 Oand conductor 1 to'the earth.

WVhen the required coin is deposited in the slit B, the lever D istilted by the weight of the coin and through its arm Iii throws thetongue J of the relay over to the position shown by dotted lines, thecontacts 0 0 spring apart, the local circuit is opened,and thetelephonic instruments, including the magneto call or battery, are putto line through the relay K K. The contacts 0 0' spring apart when thepressure of thetongue J is removed therefrom. Connnunication being thuseffected with the exchange, the subscriber can communicate with theoperator at the exchange in the usual way. The time during which thecommunication shall last, however, is under the control of the exchangeoperator, who can cut ott the communication at any moment by simplysending a current of electricity of the proper polarity from a suitablebattery or generatorover the line, to cause the polarized relay K tobring itstongue J back to the position shown by full lines, and soshort-circuit the users telephonic instruments. The coils of the relay Kare so wound as not to respond to the rapidly alternating currentsproduced by the magneto-generator of the subscriber, but so that asuitable battery or similar generator will cause the deflection of thetongue J to either side, as may be required.

Instead of leaving the question of the length of time during which thecommunication may continue to the will of the exchange operator, theabove-described call-box may be provided with an attachment whereby theconnection effected by the user through the deposit ot' the coin will beautomatically terminated at the end of a specific period of time. "ehave illustrated such a device in Figs. 3, 4, and 7 of the drawings.This attachment consists, essentially, of a train of clock-work gearingS, Fig. 4, provided with a pallet V and escapewheel as shown, and havingan arm 7* to act on the end P of a lever I, which in turn can act on acam-like projection J on the tongue J, and may also be acted on by asecond cam J, also on the said tongue. \Vhen this tongue is in theposition shown by full lines in Fig. 4-, the lever 1 will be in theposition shown in Fig. 7 and will retain the arm 0' of the clock-work.\Vhen the tongue J is thrown over to the position indicated by dottedlines by the deposit of the coin in the manner above described, the camor inclined pro jection J, carried by the tongue J, will throw down theend P 01' the leverP and release the linger i, which is then caused bythe train of clock-work to rotate in the direction of the arrow, Fig. 7.At the end of a specified time the finger 0', on completing itsrevolution, will come into contact with the end P of the lever P, and,throwing up its opposite end, will, by causing such end to come intocontact with the cam J 2 of the tongue J, cause the latter to return tothe position indicated by full. lines, and so cut oit connection withthe central office, as above forth.

In combination with the above-described instrument an indicator orregister Q, Figs. 3 and it, maybe used to indicate the numberot timesthe communication is effected with the central office. A counter orregister Q, as shown in Figs. 1 and 2, may be used, to be operated bythe lever D.

Although we prefer the above-described automatic call-box for use inconnection with the ordinary telephonic instruments, we do not wish torestrict our invention thereto.

Another simple form of our invention, for instance, is illustrated inFigs. 5 and 6, in which the introduction 01' the coin actuates a simplemechanical device to momentarily close the calling-circuit to thecentral ol'tice'. In this case the balance-lever D, which is tilted bythe depositing of the coin in the manner described with reference toFigs. 1 and 2, carries a contact-arm f, which is normally in contactwith a stop R, the latter being in electrical. connection through theconductor with the telephonic instruments. The post on which. the loverI) is mounted and the lever itself are in electrical communication withthe line through the conductor 1. On the opposite side of thecontact-tingerfis a stop R which is in electrical communication throughthe conductor with the earth, this circuit containing a battery or othersuitable generator necessary to make it a local calling-circuit.

Normally, as illustrated in Fig. 5, the ti nger fis in contact with thestop R and the telephonic instruments are to line. \Vhen the coin isdeposited, however, the consequent tilting of the lever D brings thefinger f into contact with the stop R and puts the callingcircuit toline momentarily, but for asu fticient length of time to call up thecentral oftice. As the lever D falls back again to its normal position,the telephonic instruments are put to line again.

\Ve claim as our invention 1. The combination of a telephonic exchangeand a users telephonic instruments with an automatic call-box having aslit for the introduction of a coin or other representation of monetaryvalue, a chute for the latter, a circuit connecting the box with theexchange, a lever to be operated by the weight of the coin, and contactsto automatically close the circuit on the deposit of the coin.

2. The combination of a telephonic exchange and a users telephonicinstruments with an automatic call-box having a slit for theintroduction of a coin or other representation of monetary value, alever adapted to be moved by the weight of the latter, a line andcalling circuit, and contacts therefor controlled by the lever toautomatically put the calling-circuit to line on the deposit of thecoin.

The combination ot a users telephonic instruments in an exchange systemwith an automatic call-box having a slit for the introduction of a coinor other representation of monetary value, a lever adapted to be movedby the Weight of the coin, and contacts controlled by the lever,substantially as set forth, whereby connection is automatically effectedto the line of the exchange on the deposit of the coin, substantially asspecified.

4. An automatic call-box having a polarized relay, with contactscontrolled by the tongue of the relay, and a lever controlling saidtongue and adapted to be operated by the introduction of a coin orsimilar article into the box to put the instruments to line, substantially as specified.

5. The combination of theusers telephonic instruments of an exchangesystem with a

